netdev - Re: [PATCH] net/bridge: use the maximum hard_header

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Date:	Wed, 25 Mar 2009 00:06:43 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	leoli@...escale.com
Cc:	shemminger@...ux-foundation.org, bridge@...ts.linux-foundation.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH] net/bridge: use the maximum hard_header_len of ports
 for bridging device

From: Li Yang <leoli@...escale.com>
Date: Wed, 25 Mar 2009 15:05:20 +0800

> On Wed, Mar 25, 2009 at 2:40 PM, David Miller <davem@...emloft.net> wrote:
> > From: Li Yang <leoli@...escale.com>
> > Date: Fri, 20 Mar 2009 17:04:29 +0800
> >
> >> The bridging device used a constant hard_header_len.  This will cause
> >> headroom shortage for ports with additional hardware header.  The patch
> >> makes bridging device to use the maximum value of all ports.
> >>
> >> Signed-off-by: Li Yang <leoli@...escale.com>
> >
> > Your driver must be able to cope with any amount of
> > available headroom, no matter what hacks we put into
> > the bridging layer.
> >
> > Please fix your driver, I'm not applying this patch.
> 
> Ok.  But it's not good to reallocate every packet generated locally.
> Why not take this patch too?

Because as Stephen showed it didn't handle all cases.

Look at the patch I posted, that's the way to go.
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